Humans are a(n) ________ based life form.
A) carbon
B) hydrogen
C) phosphorus
D) nitrogen
E) oxygen
Correct Answer:
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Q87: A vector is an organism that _
A)
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Q90: An organism occupying the 3rd trophic level
Q91: In succession, facilitation refers to_ .
A) species sharing
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Q97: This figure best depicts _ 
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